单项选择题

The best title for this passage is ______.

A．Educational Investment and Its Return
B．All Are Entitled to an Equal Start
C．Education in Civilized Nations
D．The Significance and Development of Education

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The golden Age of Greece came in the 5th century B.C. and the Olympic Games contributed the greatness of this period mainly by ______.

单项选择题

In the first paragraph, it can be concluded that ______.

A．people have no need to worry cell phones can cause cancer
B．it is not dangerous for long-term cell-phone users
C．cell-phone users reassure them about using cell-phones
D．they found a slightly increased risk for a rare type of brain cancer